view.qml

import QtQuick 2.0

ListView {
    width: 100
    height: 100
    anchors.fill: parent
    model: myModel
    delegate: Component {
        Rectangle {
            height: 25
            width: 100
            Text {
                function displayText() {
                    var result = ""
                    if (typeof display !== "undefined")
                        result = display + ": "
                    result += modelData
                    return result
                }

                text: displayText()
            }
        }
    }
}

usingmodel.py

import os
import sys
from PySide6.QtCore import QAbstractListModel, Qt, QUrl, QByteArray
from PySide6.QtGui import QGuiApplication
from PySide6.QtQuick import QQuickView

class PersonModel (QAbstractListModel):
    MyRole = Qt.UserRole + 1

    def __init__(self, parent = None):
        QAbstractListModel.__init__(self, parent)
        self._data = []

    def roleNames(self):
        roles = {
            PersonModel.MyRole : QByteArray(b'modelData'),
            Qt.DisplayRole : QByteArray(b'display')
        }
        return roles

    def rowCount(self, index):
        return len(self._data)

    def data(self, index, role):
        d = self._data[index.row()]

        if role == Qt.DisplayRole:
            return d['name']
        elif role == Qt.DecorationRole:
            return Qt.black
        elif role == PersonModel.MyRole:
            return d['myrole']
        return None

    def populate(self):
        self._data.append({'name':'Qt', 'myrole':'role1'})
        self._data.append({'name':'PySide', 'myrole':'role2'})

if __name__ == '__main__':
    app = QGuiApplication(sys.argv)
    view = QQuickView()
    view.setResizeMode(QQuickView.SizeRootObjectToView)

    myModel = PersonModel()
    myModel.populate()

    view.rootContext().setContextProperty("myModel", myModel)
    qmlFile = os.path.join(os.path.dirname(__file__), 'view.qml')
    view.setSource(QUrl.fromLocalFile(os.path.abspath(qmlFile)))
    if view.status() == QQuickView.Error:
        sys.exit(-1)
    view.show()

    app.exec_()
    # Deleting the view before it goes out of scope is required to make sure all child QML instances
    # are destroyed in the correct order.
    del view